Nope, its been rock solid.
It only gets annoying if the computer crashes. 80% of the time, when you restart, the computer runs slightly slower because the drives have to rebuild.
This takes like 2 hours, but it doesn't entirely stop you from doing anything. The noise though is pretty bad
My brothers RAID on the other hand on his Asus board has somehow turned itself off, and they each on every partition now, have 2 seperate 500gb drives.
I blaim that on them though. Computers and they, do not mix.